LOSING WATER

2003 International Truck • 6 cylinder AWD Manual •

We have an 2003 International that is losing water and no leak is visible. Help! It has not run hot yet - we just keep adding water or antifreeze. The truck has been to Raney's Truck repair and cannot locate the problem. About a week ago the oil pressure dropped to zero, Raney's put on a new sensor but we are still losing water!